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BEGIN:VEVENT
DTSTAMP:20180218T050803Z
LAST-MODIFIED:20170320T165034Z
DTSTART:20170327T190000Z
DTEND:20170327T200000Z
UID:event1750@bu.edu
URL:http://physics.bu.edu/events/show/1750
SUMMARY:Intermittent Many-Body Dynamics at Equilibrium
DESCRIPTION:Featuring Sergej Flach\, Institute for Basic Science\, Daejeon\
, South Korea\n\nPart of the Condensed Matter Theory Seminar Series.\n\nThe
equilibrium value of an observable defines a manifold in the phase space o
f an ergodic\nand equipartitioned many-body system. A typical trajectory pi
erces that manifold infinitely\noften as time goes to infinity. We use thes
e piercings to measure both the relaxation time of\nthe lowest frequency ei
genmode of the Fermi-Pasta-Ulam chain\, as well as the fluctuations of the
subsequent dynamics in equilibrium. We show that previously obtained scalin
g laws for\nequipartition times are modified at low energy density due to a
n unexpected slowing down of\nthe relaxation. The dynamics in equilibrium i
s characterized by a power-law distribution of\nexcursion times far off equ
ilibrium\, with diverging variance. The long excursions arise from\nsticky
dynamics close to regular orbits in the phase space. Our method is generali
zable to\nlarge classes of many-body systems.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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